Re: [Tutor] dict['_find']
"Max Niederhofer" wrote
first post, please be gentle. I'm having serious trouble finding an
alternative for the deprecated find module for dictionaries.
I think you are misunderstanding some of the terminology.
There is no deprecated find module. You are not using
any modules in your code. And you are not doing anything
special with "_fnd", it is just a string which you use as a
key in your dictionary.
cities = {'CA': 'San Francisco', 'MI': 'Detroit', 'FL':
'Jacksonville'}
def find_city(themap, state):
if state in themap:
return themap[state]
else:
return "Not found."
cities['_find'] = find_city
What this does is assign the function find_city as the value
corresponding to the key "_find" in your dictionary.
You could use any name you like:
'check' would be one meaningful example...
However, there is no obvious reason to put the
function in the dictionary at all...?
while True:
print "State? (ENTER to quit)",
state = raw_input("> ")
if not state: break
This loops round collecting state names from the user
and throwing them away until the user eventually gets
fed up and hits enter. At that point state holds an
empty string. I don't think you want that.
city_found = cities['_find'](cities, state)
print city_found
I think you want this inside the loop above...
My question is - how do I rewrite this using an alternate module
given
find is deprecated?
'_find' is just a key, as such it is not deprecated.
What made you think it was? Did you get an error message?
If so always post the entire error text, it helps us enormously.
reference, I'm using 2.6.1 on darwin.
With the slight change to the indentyation of the last two lines
your code should work.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] dict['_find']
Am 20.02.2011 05:14, schrieb Max Niederhofer:
Hello all,
Hello Max,
first post, please be gentle. I'm having serious trouble finding an
alternative for the deprecated find module for dictionaries.
The code (from Zed Shaw's Hard Way, exercise 40) goes something like
this. Hope indentation survives.
cities = {'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}
I use a naming convention for dicts that has made me very happy on
several occasion ;-):
key_to_value, in your case
state_to_city = {...}
def find_city(themap, state):
if state in themap:
return themap[state]
else:
return "Not found."
cities['_find'] = find_city
Did you put this entry into the same dictionary as the data on purpose?
Or is the purpose a kind of dispatch? Something that could be a dict on
its own, like
private_function_name_to_function = {'_find': find_city}
You should try to keep things seperate and explicit.
while True:
print "State? (ENTER to quit)",
state = raw_input("> ")
if not state: break
city_found = cities['_find'](cities, state)
print city_found
My question is - how do I rewrite this using an alternate module given
find is deprecated? Grateful for all suggestions or pointers. For
reference, I'm using 2.6.1 on darwin.
Thanks so much for your help.
Best,
Max
--
Dr. Maximilian Niederhofer
Founder, Qwerly
http://qwerly.com/ | http://qwerly.com/max
+44 78 3783 8227
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Re: [Tutor] dict['_find']
Steven, Alan, Knacktus,
thanks for your help. I was indeed very confused because I thought
'_find' was calling something special instead of just being added to
the dictionary (the confusion stemming from
http://www.python.org/dev/peps/pep-0004/ where find module is
obsolete).
When I ran the code, the error I got was:
max:python max$ python ex40.py
State? (ENTER to quit) > CA
Traceback (most recent call last):
File "ex40.py", line 22, in
city_found = cities['_find'](cities, state)
File "ex40.py", line 8, in find_city
return themap(state)
TypeError: 'dict' object is not callable
Two main mistakes: (1) not including the actual search in the while
loop and (2) wrong parentheses in return themap(state) instead of
return themap[state].
Fixed version which runs:
cities = {'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}
def find_city(themap, state):
if state in themap:
return themap[state]
else:
return "Not found."
cities['_find'] = find_city
while True:
print "State? (ENTER to quit)",
state = raw_input ("> ")
if not state: break
city_found = cities['_find'](cities, state)
print city_found
Thanks for your help, especially the comments about keeping things
separate and explicit. Now to find out why Zed Shaw thinks this is a
good way of doing it...
Best,
Max
On Sun, Feb 20, 2011 at 9:40 AM, Knacktus wrote:
> Am 20.02.2011 05:14, schrieb Max Niederhofer:
>
>> Hello all,
>
> Hello Max,
>>
>> first post, please be gentle. I'm having serious trouble finding an
>> alternative for the deprecated find module for dictionaries.
>>
>> The code (from Zed Shaw's Hard Way, exercise 40) goes something like
>> this. Hope indentation survives.
>>
>> cities = {'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}
>
> I use a naming convention for dicts that has made me very happy on several
> occasion ;-):
> key_to_value, in your case
> state_to_city = {...}
>>
>> def find_city(themap, state):
>> if state in themap:
>> return themap[state]
>> else:
>> return "Not found."
>>
>> cities['_find'] = find_city
>
> Did you put this entry into the same dictionary as the data on purpose?
> Or is the purpose a kind of dispatch? Something that could be a dict on its
> own, like
> private_function_name_to_function = {'_find': find_city}
> You should try to keep things seperate and explicit.
>>
>> while True:
>> print "State? (ENTER to quit)",
>> state = raw_input("> ")
>>
>> if not state: break
>>
>> city_found = cities['_find'](cities, state)
>> print city_found
>>
>> My question is - how do I rewrite this using an alternate module given
>> find is deprecated? Grateful for all suggestions or pointers. For
>> reference, I'm using 2.6.1 on darwin.
>>
>> Thanks so much for your help.
>>
>> Best,
>> Max
>>
>> --
>> Dr. Maximilian Niederhofer
>> Founder, Qwerly
>> http://qwerly.com/ | http://qwerly.com/max
>> +44 78 3783 8227
>> ___
>> Tutor maillist - Tutor@python.org
>> To unsubscribe or change subscription options:
>> http://mail.python.org/mailman/listinfo/tutor
>
> ___
> Tutor maillist - Tutor@python.org
> To unsubscribe or change subscription options:
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>
--
Dr. Maximilian Niederhofer
Founder, Qwerly
http://qwerly.com/ | http://qwerly.com/max
+44 78 3783 8227
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[Tutor] how to connect to Django's irc
hi guys,
does anyone know how to connect to the Django's irc,
As django is based on python there asking from you guys,
thanks
From: Alan Gauld
To: tutor@python.org
Sent: Wed, January 19, 2011 8:04:23 PM
Subject: Re: [Tutor] Decoding from strange symbols
"Oleg Oltar" wrote
> I am trying to decode a string I took from file:
>
> file = open ("./Downloads/lamp-post.csv", 'r')
I assume you know what its supposed to represent? What the columns etc are
intended to be? Otherwise it will be a challenge!
There is a section here that looks like the months of the year (English) in
reverse:
\x00S\x00e\x00a\x00r\x00c\x00h\x00e\x00s\x00\t\x00D\x00e\x00c\x00
\x002\x000\x001\x000\x00\t\x00N\x00o\x00v\x00
\x002\x000\x001\x000\x00\t\x00O\x00c\x00t\x00
\x002\x000\x001\x000\x00\t\x00S\x00e\x00p\x00
\x002\x000\x001\x000\x00\t\x00A\x00u\x00g\x00
\x002\x000\x001\x000\x00\t\x00J\x00u\x00l\x00
\x002\x000\x001\x000\x00\t\x00J\x00u\x00n\x00
\x002\x000\x001\x000\x00\t\x00M\x00a\x00y\x00
\x002\x000\x001\x000\x00\t\x00A\x00p\x00r\x00
\x002\x000\x001\x000\x00\t\x00M\x00a\x00r\x00
\x002\x000\x001\x000\x00\t\x00F\x00e\x00b\x00
\x002\x000\x001\x000\x00\t\x00J\x00a\x00n\x00
Otherwise its all a bit arbitrary...
HTH,
-- Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] how to connect to Django's irc
On 02/20/2011 01:03 PM, shaheryar ali wrote: > hi guys, > > does anyone know how to connect to the Django's irc, > As django is based on python there asking from you guys, > > > thanks > Point your favorite client at irc.freenode.net or use http://webchat.freenode.net/. #django You'll have better luck with django-specific questions on the django mailing list. -- Corey Richardson I've never known any trouble which an hour's reading didn't assuage. -Charles De Secondat ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to connect to Django's irc
On 2/20/2011 1:03 PM, shaheryar ali wrote:
hi guys,
does anyone know how to connect to the Django's irc,
As django is based on python there asking from you guys,
thanks
I don't know BUT what is the relevance of the following to your question?
If it is not relevant why did you include it?
Please in the future start a new email - do NOT spring off an existing one.
*From:* Alan Gauld
*To:* tutor@python.org
*Sent:* Wed, January 19, 2011 8:04:23 PM
*Subject:* Re: [Tutor] Decoding from strange symbols
"Oleg Oltar" mailto:oltarase...@gmail.com>> wrote
> I am trying to decode a string I took from file:
>
> file = open ("./Downloads/lamp-post.csv", 'r')
I assume you know what its supposed to represent? What the columns etc
are intended to be? Otherwise it will be a challenge!
There is a section here that looks like the months of the year
(English) in reverse:
\x00S\x00e\x00a\x00r\x00c\x00h\x00e\x00s\x00\t\x00D\x00e\x00c\x00
\x002\x000\x001\x000\x00\t\x00N\x00o\x00v\x00
\x002\x000\x001\x000\x00\t\x00O\x00c\x00t\x00
\x002\x000\x001\x000\x00\t\x00S\x00e\x00p\x00
\x002\x000\x001\x000\x00\t\x00A\x00u\x00g\x00
\x002\x000\x001\x000\x00\t\x00J\x00u\x00l\x00
\x002\x000\x001\x000\x00\t\x00J\x00u\x00n\x00
\x002\x000\x001\x000\x00\t\x00M\x00a\x00y\x00
\x002\x000\x001\x000\x00\t\x00A\x00p\x00r\x00
\x002\x000\x001\x000\x00\t\x00M\x00a\x00r\x00
\x002\x000\x001\x000\x00\t\x00F\x00e\x00b\x00
\x002\x000\x001\x000\x00\t\x00J\x00a\x00n\x00
Otherwise its all a bit arbitrary...
HTH,
-- Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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--
Bob Gailer
919-636-4239
Chapel Hill NC
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Re: [Tutor] tic tac toe
On 2/20/2011 9:49 AM, Ben Ganzfried wrote: Thanks, Bob. I'd love some specific feedback. Exactly what did I offer that you found useful? Also please always reply-all so a copy goes to the list. -- Bob Gailer 919-636-4239 Chapel Hill NC ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] creating classes while coding
I know that Python not only supports OOP, but is fundamentally OOP in its design. Just in using the language and standard library, that much becomes obvious. However, I do wonder a bit about the practice I have seen of some Python programmers to implement relatively short bits of code, that would be quite simple using functions and procedural code, with classes. Some such code appears far more complicated than the job at hand really demands. I know there is not always a single right or wrong way of accomplishing programming task, but why implement using classes unnecessarily? When is it necessary? When is it best practice? I'll freely admit that I do not come from an OOP programming background, so designing classes is not my first impulse when writing code. Am I missing something? --Bill ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] creating classes while coding
> I'll freely admit that I do not come from an OOP programming > background, so designing classes is not my first impulse when > writing code. Am I missing something? In my book, no, you're not missing something. I refer to it as "drinking the OO kool-aid". It's not compulsory. I just use it when it makes sense. Alan ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] creating classes while coding
That raises my next question. Under what sort of programming circumstances does it make sense? --Bill On Sun, Feb 20, 2011 at 19:01, R. Alan Monroe wrote: > > I'll freely admit that I do not come from an OOP programming > > background, so designing classes is not my first impulse when > > writing code. Am I missing something? > > In my book, no, you're not missing something. I refer to it as > "drinking the OO kool-aid". It's not compulsory. I just use it when it > makes sense. > > Alan > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] creating classes while coding
"Bill Allen" wrote However, I do wonder a bit about the practice I have seen of some Python programmers to implement relatively short bits of code, that would be quite simple using functions and procedural code, with classes. OOP is often overkill, but if its the normal way of programming - and for many recent students its all they get taught - then using classes is the natural approach. "When all you have is a hammer everything looks like a nail..." However, there may be good reasons. Classes make reuse easier, in general, than functions. So if the task may become a building block for a future project, or even an extended version of the current one then building a class makes sense. code appears far more complicated than the job at hand really demands. I know there is not always a single right or wrong way of accomplishing programming task, but why implement using classes unnecessarily? Why do anything unnecessarily? 1) You may not know another way. 2) You may have an extended use case in mind that is not directly related to the task at hand 3) Somebody said it was "the right way to do it" 4) A learning exercise (do we really need so many text editors?!) 5) Obstinacy - I've started so I'll finish! and probably more... When is it necessary? When is it best practice? When reuse is an issue, When multiple instances of the problem need to be created (think parallel processing), When it has to fit with a bigger project context (which is using OOP). When objects naturally fit a complex problem domain - think GUIs. I'll freely admit that I do not come from an OOP programming background, so designing classes is not my first impulse when writing code. Am I missing something? Yes, but not as much as you might think! But when you do start to think OOP before functions you will probably find it less surprising! :-) HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] creating classes while coding
On Sun, Feb 20, 2011 at 19:59, Alan Gauld wrote: > > "Bill Allen" wrote > > > However, I do wonder a bit about the practice I have seen of some >> Python programmers to implement relatively short bits of code, that would >> be >> quite simple using functions and procedural code, with classes. >> > > OOP is often overkill, but if its the normal way of programming > - and for many recent students its all they get taught - then using > classes is the natural approach. "When all you have is a hammer > everything looks like a nail..." However, there may be good reasons. > Classes make reuse easier, in general, than functions. So if the > task may become a building block for a future project, or even > an extended version of the current one then building a class > makes sense. > Thanks for the feedback. Particularly when it comes to reuse of code, I can see it could be worth my time to look into designing classes a bit more. I am starting to write enough code now that I am beginning to reuse some bits of it regularly. I have not yet taken the reuse of code further than packaging up some functions into modules. I'll look into this further. You mentioned the programming methods being taught programming students nowadays. That OOP is a basic programming method being taught sure leaves me in the dust. The last formal programming class I took in college was way back in the early 90s and it was to learn IBM 370 Assembly Language. OOP was not only not on the radar, it was not even in the same solar system!:-D feeling kinda old, and I am not all that old... --Bill ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
